Quoted from Djshakes:
Has anyone ever experienced a tilt error on multiball? I was rocking it, blinders out after both jackpot shots. Hammering away on flippers and the game tilted out and shut down. The blinders opened and closed multiple times during the tilt phase. Seemed to last longer than normal and I got no danger warning. It was almost like the machine glitched out. Sucks because I was having a hell of a game. I didn't physically tilt.
Sounds like a phantom slam tilt. This happens when the switch matrix gets tricked into thinking the slam tilt switch is closed.
I've trouble shot on Williams machines and fixed it. But not on data east.
Check out phantom slam tilts in search.
Pretty sure there's some pinwiki about phantom closures as well.
See if this helps! Check every diode and connection. It HAS to be a combination of 4 switches closing at same time... and the slam tilt is one of them. Get out the matrix and and start looking at possible combinations. It's a pain in the butt... but solves a MAJOR problem.
If it only happens in multiball... I'd start with trough switches since those are normally closed during non-multiball game play.